Has this been fixed? I have had to change several of the drives. The 1351, may be an effect, not the cause. The 72 says it's been off and the batteries are discharged too low to run. I would clear the errors, menu 50 submenu 5 set it to 1. Then see what happens menu 50 submenu 1 will show the errors it has. If the unit is shut off and the batteries in the TSU are not unplugged, they will discharge and it will not run at all even on PEBO. I have had to sit a good set of batteries outside the LDU and use them. Traveler 11 is the door zone, unplug it and PEBO it up, Take the escape hatch loose and get a ladder in the car to get on top.